Slotted slip element for expandable packer

a technology of expandable packers and slip slots, which is applied in the direction of sealing/packing, fluid removal, borehole/well accessories, etc., can solve the problems of unsuitability for use of barrel slips described in the swor patent, prone to rupturing, and difficult to place axial slots in the slip mandrel to make it easier to expand

Inactive Publication Date: 2005-09-01
BAKER HUGHES HLDG LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A problem arises when a separate slip mandrel is placed to radially surround the expansion mandrel.
Placing axial slots in the slip mandrel to make it easier to expand is problematic.
Slotting the slip mandrel will necessarily weaken it and possibly render it vulnerable to rupturing during expansion of the expansion mandrel.
The type of barrel slip described in the Swor patent would be unsuitable for use with a radially expandable packer that uses a radially expandable expansion mandrel to urge the slip mandrel into setting.

Method used

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Examples

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Embodiment Construction

[0020]FIGS. 1-3 depict an exemplary packer assembly 10. As best shown in FIG. 1, the packer assembly 10 has a generally tubular central packer mandrel 12 that defines an axial flowbore 14 along its length. The central axis of the packer mandrel 12 and the packer assembly 10 is shown at 16. The central packer mandrel 12 is preferably formed of a very hard, non-malleable material, such as 4140 steel. Although not depicted in FIG. 1, it will be understood by those of skill in the art that opposite axial ends of the packer mandrel 12 are typically threaded to allow the packer assembly 10 to be incorporated into a string of tubing members and, thereafter, to be disposed within a wellbore for setting.

[0021] An expansion mandrel 18 radially surrounds the packer mandrel 12. The expansion mandrel 18 may be formed of 4140 steel also, but is typically of a lesser thickness than the central mandrel 12 so that it can be expanded radially outwardly. A hydraulic pressure chamber 20 is defined bet...

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PUM

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Abstract

A packer device includes a central packer mandrel and a radially surrounding expansion mandrel that can expand radially. At least one slip mandrel carrying wickers surrounds the expansion mandrel and a plurality of axial slots are disposed within the slip mandrel.

Description

[0001] This application is a continuation-in-part of U.S. patent application Ser. No. 10 / 117,521 filed on Apr. 5, 2002.BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention [0003] The invention relates generally to wellbore packer assemblies and, in particular aspects, to the design of slip devices that are carried upon such packer assemblies. [0004] 2. Description of the Related Art [0005] Traditional packers are comprised of an elastomeric sealing element and at least one mechanically set slip. Typically, a setting tool is run in with the packer to set it. The setting can be accomplished hydraulically due to relative movement created by the setting tool when subjected to applied pressure. This relative movement causes the slips to ride up on cones and extend into biting engagement with the surrounding tubular. At the same time, the sealing element is compressed into sealing contact with the surrounding tubular. The set can be held by a body lock ring, which would prevent th...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): E21B23/06E21B33/12E21B33/129
CPCE21B23/06E21B33/1208E21B33/1293E21B33/129E21B33/1216
Inventor DOANE, JAMES C.HARPER, JASON M.
Owner BAKER HUGHES HLDG LLC
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